a-a a-b a-i a-t aaa aab aae aag aai aao aat ab- aba abb abe abg abi abo abt aea aeb aee aeg aei aeo aet ag- aga agb age agg agi ago agt ai- aia aib aie aig aii aio ait aoa aob aoe aog aoi aoo aot at- ata atb ate atg ati ato att baa bab bae bag bai bao bat bba bbb bbe bbg bbi bbo bbt be- bea beb bee beg bei beo bet bga bgb bge bgg bgi bgo bgt bi- bia bib bie big bii bio bit boa bob boe bog boi boo bot bta btb bte btg bti bto btt eaa eab eae eag eai eao eat eba ebb ebe ebg ebi ebo ebt eea eeb eee eeg eeo eet ega egb ege egg egi ego egt eia eib eie eig eii eio eit eo- eoa eob eoe eog eoi eoo eot eta etb ete etg eti eto ett gaa gab gae gag gai gao gat gba gbe gbg gbi gbo gbt ge- gea geb gee geg gei geo get gga ggb ggg ggi ggo ggt gia gib gie gig gii gio git goa gob goe gog goi goo got gta gtb gte gtg gti gto gtt ia- iaa iab iae iag iai iao iat iba ibb ibe ibg ibi ibo ibt ie- iea iee ieg iei iet iga igb ige igg igi igo igt iia iib iie iii iio iit io- ioa iob ioe iog ioi ioo iot ita itb ite itg iti ito itt o-i oaa oab oae oag oai oao oat ob- oba obb obe obg obi obo obt oea oeb oee oeg oei oeo oet oga oge ogg ogi ogo ogt oia oib oie oii oio oit oo- ooa oob oog ooi ooo oot ot- ota otb ote otg oti oto ott taa tab tae tag tai tao tat tba tbb tbe tbg tbi tbo tbt te- tea teb tee teg tei teo tet tga tgb tge tgg tgi tgo tgt tia tib tie tig tii tio tit to- toa tob toe tog toi too tot tta ttb tte ttg tti tto ttt